There's really not a lot on the mainlands. Basically, the resources are seals and whales, neither of which are really necessary to the Portugese.
Knowledge might butterfly sealing and whaling industries though, causing them to occur somewhat earlier. Which might lead to species depletion earlier. Which would then have effects on the early new England of the first have of the 19th century. Perhaps extractive expeditions would be in decline with the supplies, the volumes smaller and more expensive, more substitution, earlier manufacturing in some areas, but overall less wealth. An earlier, but more modest industrial revolution, with the north more economically subordinate to the southern states?